191132321 has 4 divisors (see below), whose sum is σ = 191162544. Its totient is φ = 191102100.

The previous prime is 191132273. The next prime is 191132351. The reversal of 191132321 is 123231191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191132321 - 2¹⁸ = 190870177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191132351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1595 + ... + 19616.

It is an arithmetic number, because the mean of its divisors is an integer number (47790636).

Almost surely, 2^191132321 is an apocalyptic number.

It is an amenable number.

191132321 is a deficient number, since it is larger than the sum of its proper divisors (30223).

191132321 is an equidigital number, since it uses as much as digits as its factorization.

191132321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30222.

The product of its digits is 324, while the sum is 23.

The square root of 191132321 is about 13825.0613380194. The cubic root of 191132321 is about 576.0294812344.

The spelling of 191132321 in words is "one hundred ninety-one million, one hundred thirty-two thousand, three hundred twenty-one".